{"uid":"cap_V5gubYQkv71uETUZGwvNH","slug":"x402-tx-preflight-diagnostic-49f9d266","name":"x402 TX Preflight Diagnostic","description":"Paid x402 diagnostics. Unpaid paid-SKU requests return HTTP 402 with eip3009 extras. Facilitator: OpenX402 only.","url":"https://openclawproductions.com/api/v1/txpreflight?utm_source=zero.xyz","method":"GET","headers":{},"bodySchema":{"type":"object","properties":{"properties":{"type":"string"}}},"responseSchema":{"type":"json","example":{"sku":"txpreflight","note":"Example paid JSON shape. Not a live settle.","price":"$0.04","title":"TX Preflight"}},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.04","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.04/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.04","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_bzSHXPT1e2N-EDhQca224","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.04","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Runs a paid transaction preflight diagnostic check via the x402 payment protocol, returning structured diagnostic data for EIP-3009 payment flows","exampleAgentPrompt":"Run an x402 TX preflight diagnostic on my payment setup — I want to confirm my EIP-3009 USDC authorization is correctly configured before I send a real transaction.","exampleUseCases":[{"title":"Validate x402 payment integration","prompt":"Can you run a tx preflight check to confirm my x402 payment flow is working? I'm building an agent that pays USDC via EIP-3009 and want to make sure the setup is correct before going live."},{"title":"Debug 402 error in payment pipeline","prompt":"My API calls keep returning HTTP 402 errors even though I think I've set up the x402 payment headers correctly — can you run a preflight diagnostic to help me figure out what's wrong?"},{"title":"Test OpenX402 facilitator connection","prompt":"Before I wire up my app to OpenX402 as the payment facilitator, can you do a quick txpreflight check to confirm the connection is live and the EIP-3009 authorization format is correct?"}],"resultDescription":"Returns a JSON object containing the SKU name ('txpreflight'), a human-readable note clarifying this is a diagnostic (not a live settlement), the price ($0.04), and a title ('TX Preflight'). Unpaid requests receive an HTTP 402 response with EIP-3009 payment extras required for authorization.","failureModes":["HTTP 402 returned when no valid x402 payment is attached — response includes EIP-3009 payment extras needed to authorize","Invalid or malformed payment token causes authorization failure","OpenX402 facilitator unavailable causes service errors","Incorrect properties parameter format may yield unexpected results"],"whenToPreferThis":"Choose this endpoint when you need to validate or debug an x402/EIP-3009 payment integration specifically using the OpenX402 facilitator. It is ideal for testing that your USDC micropayment authorization headers are correctly formed before committing to a real transaction. Not suitable for non-x402 payment systems or general API health checks.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-02T04:39:22.023Z","isFirstParty":false,"canonicalSlug":"x402-tx-preflight-diagnostic-49f9d266"}